Engine Diesel Engines
• The position of the ISV is controlled by the PCM, which activates the DC motor via a duty
signal.
M6FL_01080
1 DC motor 3 Current detection circuit
2 PCM
• When the required EGR rate is high the PCM controls the DC motor with a large duty
cycle. As a result, the ISV closes halfway, reducing the cross-section of the intake pipe.
Thus a vacuum is generated in the intake manifold and a large amount of exhaust gas
can be recirculated.
• When the required EGR rate is low the PCM controls the DC motor with a small duty
cycle. As a result, the ISV opens, making the complete cross-section of the intake pipe
available. Thus atmosphere or boost pressure is generated in the intake manifold
(depending on the operating conditions) and only a small amount of exhaust gas can be
recirculated.
• When the engine is switched off the PCM controls the DC motor with maximum duty
cycle. As a result, the ISV closes fully and no air is induced into the engine, preventing
bucking movements during shut-off.
Service Training Mazda6 Facelift 01-57
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